Synthesis of iron oxide cubes/reduced graphene oxide composite and its enhanced lithium storage performance

Layer-by-layer anodes with an orientation-arranged structure induced by magnetic field for high-performance lithium ion batteries

“…4d). The 4L-Fe 3 O 4 /CF anode performs better (1671.3 mA h g −1 at a current density of 0.1 A g −1 ; 504.6 mA h g −1 at 3 A g −1 ) than many reported Fe 3 O 4 -based anodes for LIBs (at 0.1 A g −1 ): ∼600 (Fe 3 O 4 /Fe 3 C/CF), 16 ∼732 (C/Fe 3 O 4/ rGO), 20 <772 (Fe 3 O 4 /rGO), 19 973 (Fe 3 O 4 /rGO), 42 1084 (porous Fe 3 O 4 /carbon microspheres (PFCMs)), 46 1101.4 (Fe 3 O 4 @C2e), 47 1334 (Fe 3 O 4 @C/rGO), 17 1411.8 (Fe 3 O 4 /C), 48 ∼1500 (hollow Fe 3 O 4 /graphene), 49 903 (at 0.2C, magnetic field-induced orientation-arranged Fe 3 O 4 /graphene nanocomposites) 38 and 1140 (at 0.2C, magnetic field assisted orientation-arranged Fe 3 O 4 nanocrystal/rGO paper) 39 mA h g −1 ; at 3 A g −1 : <250 (α-Fe 2 O 3 @Fe 3 O 4 heterostructure (CFH)), 21 335.8 (Fe 3 O 4 /rGO), 19 <400 (Fe 3 O 4 /Fe 3 C/CF), 16 <400 ( N -doped carbon nanofibers (Fe 3 O 4 /NCNFs)), 50 240 (at 5C, magnetic field-induced orientation-arranged Fe 3 O 4 /graphene nanocomposites), 38 <500 (Fe 3 O 4 @C/rGO) 51 and ∼500 (porous Fe 3 O 4 /carbon microspheres (PFCMs) 46 mA h g −1 ). Hence, such a layer-by-layer Fe 3 O 4 /CF alignment provides a novel method for advanced electrodes, which might be widely used in areas as supercapacitors, catalysis, adsorbents and fuel cells.…”

“…13,14 Moreover, the poor intrinsic conductivity of transition metal oxides or sulfides also limits the performance of anodes. 15,16 In recent years, many studies have investigated methods to overcome the above defects: one strategy is loading these active materials on a conductive framework (such as graphene, porous carbon, amorphous carbon) to enhance the transfer of electrodes; 17–21 the preparation of an active materials@shell structure is another strategy to buffer the excessive volume effect as the strong skeleton of shells limits the volume change of active materials in charge/discharge processes. 8,22–27 Additionally, modifying the structure of electrodes is also an efficient strategy to conquer the above challenges.…”

Effect of Fe(III) Species on the Stability of a Water-Model Oil Emulsion with an Anionic Sulfonate Surfactant as an Emulsifier

“…In a mixed system of an anionic surfactant and a nonionic surfactant, on the one hand, the existence of EO groups can reduce the electrostatic repulsion between anionic head groups, and the surfactants are closely arranged at the interface. On the other hand, when multivalent counterions exist, EO groups can hinder the transition of the surfactant at the interface from monolayer to multilayer, and when the concentration of EO groups remains unchanged, there is a greater concentration of multivalent counterions and more adsorption layers. − Therefore, we believe that in the O/W emulsion, due to the low concentration of Fe­(III) species compared with the former, EO groups play a major role in hindering the formation of a multilayer structure of the surfactant at the interface, resulting in a low strength of the interfacial film. Therefore, compared with the O/W emulsion without EO groups, its stability is poor.…”

Thiophene or Pyridine-Substituted Quinoline Derivatives: Synthesis, Properties, and Electropolymerization for Energy Storage

“…Supercapacitors store energy based on charge separation on the electroelectrolyte double layer (EDLC), or based on the redox process of the electrode material (pseudocapacitors and battery-type capacitors) [1]. Compared to EDLC where carbon-based materials [2] are frequently adopted, pseudocapacitors and battery-type capacitors usually employ redox active species, including metal oxides [3,4] and conducting polymers as electrode material and generally show larger capacitances [5]. Among them, conducting polymers feature flexibility and easily-tailored redox properties by functionalization [6], and are utilized as electrode materials to effectively tune the achievable voltage of supercapacitors [7,8].…”